Count Peter Alekseyevich Pahlen (Russian: Пётр Алексеевич Пален; German: Peter Ludwig von der Pahlen) (July 17, 1745 – February 13, 1826) was a Russian courtier who played a pivotal role in the assassination of Emperor Paul.

He became a general in 1798, a count in 1799, and was the Military Governor of St. Petersburg from 1798 to 1801.

Pahlen stemmed from a family of Baltic nobles. He was born in the manor of Palmse, in present-day Vihula Parish, Lääne-Viru County, Estonia. He served in the horse guards and saw service in the Russo-Turkish Wars. He was wounded at Bendery and invested with the Order of St George of the 4th degree. During the Russo-Turkish War, 1787-92 he distinguished himself during the Siege of Ochakov (order of St. George the 3rd degree).

In 1787 Pahlen was put in charge of the Riga Governorate. He conducted the negotiations leading to the incorporation of Courland, Semigalia, and other Biron possessions into the Russian Empire. After that, he was appointed the first Governor General of Courland guberniya (1795).

On December 3, 1796 Pahlen was appointed to run a cuirassier regiment of Riga, but soon the new Emperor made him regret his former contacts with the disgraced prince Platon Zubov.

In January 1797 Pahlen was discharged from of governorship, and on 26 February he was relieved from his post in the regiment and excluded from the service.

However, he was soon again accepted to the active service and appointed the inspector of the cavalry and the commander of the household troops of horse regiment. He was rapid in acquiring the sovereign's confidence. Enjoying the unlimited favor of Pavel I, for three years (1798–1801) he served as the military governor of Saint Petersburg, the governor of Baltic provinces, the inspector of 6 military inspections, the great chancellor of the Maltese order, the chief director of mail, the member of council and board of foreign affairs.

During his time in office the building of St Michael's Castle and sea military school was completed. The Field of Mars was graced with monuments honoring Field Marshal Rumyantsev and Alexander Suvorov. The iron foundry was transferred from Kronstadt to Petersburg. Nikolai Rezanov founded the Russian-American Company.

In August 1800 Pahlen was discharged from his governorship, only to be reappointed on October 21. Seeing how fragile his position was, he joined the conspirators plotting against the emperor in the house of Olga Zherebtsova. Together with Nicholas Zubov he was one of plot's leaders and organizers. In the plot he played a dual role, trying in the case of failure to conceal his participation.

He extracted from the emperor the written order to arrest his son and heir, Alexander Pavlovich, and showed this to him in order to overcome his fluctuation in the plot. He was present during Paul's strangling on the night of March 12, 1801. After the assassination he acquired an irreconcilable enemy in the Empress Maria Feodorovna who prevented him from occupying any important post under Alexander's reign. On 1 April 1801, he was discharged from the service and ordered to withdraw into his estates in Courland. Pahlen died in Mitava on February 13, 1826.

In 1908 Dmitry Merezhkovsky wrote the play "Pavel I", which enjoyed limited popularity in Russia. In 2003 the director Vitaly Melnikov adapted the play into the movie "Poor, Poor Pavel". In contrast to the play, the accent in the film is made not only on the fate of Pavel I, but also on Pahlen's role in the plot against him. Pahlen is seen as the tragic figure, which arranged the plot against his own will, worrying not about himself, but about the good of Russia. The role of Pahlen was played by Oleg Yankovsky, that of Paul - by Viktor Sukhorukov.

In 1928, Lewis Stone played Pahlen in "The Patriot," starring Emil Jannings as Paul I. This film is considered lost, although fragments of it still exist in the UCLA Film Archives.

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